Definition(s)
Combustible Liquid (Class II, IIIA, and IIIB Liquids)
Any liquid that has a closed-cup flash point at or above 37.8 °C (100 °F), as determined by the test procedures and apparatus outlined in NFPA 30. Combustible liquids are subdivided as follows:
Class II liquids – Liquids having flash points at or above 37.8 °C (100 °F) and below 60 °C (140 °F).
Class IIIA liquids – Liquids having flash points at or above 60 °C (140 °F) and below 93 °C (200 °F).
Class IIIB liquids – Liquids having flash points at or above 93 °C (200 °F).
API RP 500, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Division 1 and Division 2, Third Edition, December 2012, Global Standards